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MS1004-Caranton.Pdf 56 Ornitología Colombiana No. 9 (2010): 56-70 A NEW SPECIES OF ANTPITTA (GRALLARIIDAE: GRALLARIA) FROM THE NORTHERN SECTOR OF THE WESTERN ANDES OF COLOMBIA Una especie nueva de tororoi (Grallariidae: Grallaria) del sector norte de la Cordillera Occidental de los Andes colombianos Diego Carantón-Ayala1 Fundacion ProAves, Cra. 20 # 36-61, Bogotá, Colombia. Grupo de Observadores de Aves del Tolima GOAT, Facultad de Ciencias, Universidad del Tolima, Ibagué, Colombia. [email protected] Katherine Certuche-Cubillos Programa de Biología, Facultad de Ciencias, Universidad del Tolima, Ibagué, Colombia. [email protected] ABSTRACT We describe the Urrao Antpitta (Grallariidae: Grallaria urraoensis), a new species of suboscine passerine endemic to high Andean forests below Páramo de Frontino, in the northern sector of the Western Andes of Colombia. The new species is similar to the Brown-banded Antpitta (Grallaria milleri) from the Central Andes, but differs from it vocally and in its slightly larger size, lack of pectoral band, duller brown-olive coloration in the upperparts, uniform light gray underparts, and whitish lores. The new species occurs in the undergrowth of primary and secondary cloud forests dominated by Chusquea bamboo at elevations between 2500-3200 m at the type locality. We present notes on the ecology, distribution, behavior, reproductive biology, vocalizations, and conservation of the new species. The montane forests in the northern sector of the Western Andes to which the Urrao Antpitta is endemic are threatened by deforestation, fragmentation, and mining. These factors, in combination with the restricted geographic and ecological distribution of the new species, make it an important priority for conservation action. Key words: Colombia, Grallaria urraoensis, high Andean forest, new species, Western Andes. RESUMEN Describimos al Tororoi de Urrao (Grallariidae: Grallaria urraoensis), una nueva especie de passeriforme suboscino endémica de los bosques altoandinos del Páramo de Frontino, sector norte de la Cordillera Occidental de los Andes de Colombia. La nueva especie es similar al Tororoi de Miller (Grallaria milleri) de la Cordillera Central, pero difiere de esta especie en sus vocalizaciones y por ser ligeramente más grande, sin banda pectoral, con coloración café-oliva más opaca por encima, gris claro uniforme en las partes inferiores y bridas blanquecinas. La nueva especie se encuentra en el sotobosque de bosques nublados primarios y secundarios dominado por bambúes del género Chusquea entre elevaciones de 2500 a 3200 m en la localidad tipo. Presentamos anotaciones sobre la ecología, distribución, comportamiento, reproducción, vocalizaciones y conservación de esta nueva especie. Los bosques de montaña del norte de la Cordillera Occidental donde se encuentra el Tororoi de Urrao están amenazados debido a deforestación, fragmentación y exploración minera. Estos factores, junto con la distribución geográfica y ecológica restringida de la nueva especie, hacen altamente prioritarios esfuerzos para su conservación. Palabras clave: Bosque altoandino, Colombia, Cordillera Occidental, Grallaria urraoensis, nueva especie. 1Present address: Grupo de Observadores de Aves del Tolima GOAT, Facultad de Ciencias, Universidad del Tolima, Ibagué, Colombia. Ornitología Colombiana No. 9 (2010) 57 INTRODUCTION the diversity and distributions of birds in the northern sector of the Western Andes (Cuervo et al. The antpittas (family Grallariidae) are terrestrial 2003, Krabbe et al. 2006, Pulgarín-R. & Múnera-P. Neotropical passerine birds of the dense understory 2006), ornithological explorations in the area of humid forests, scrublands, and alpine habitats remain sparse. More generally, the avifauna of this with scattered bushes in the high Andes. Because of cordillera as a whole remains insufficently their retiring habitats, antpittas are difficult to documented, as evidenced by several new records observe and collect, and information on most implying significant range extensions for multiple aspects of their biology is scarce (Krabbe & species (Cuervo et al. 2003), and especially by the Schulenberg 2003; Greeney et al. 2008). The group recent discovery of four species new to science reaches its highest diversity in the tropical Andes, (Salaman & Stiles 1996; Robbins & Stiles 1999; especially above 800 m, where many species have Salaman et al. 2003; Cortés-Diago et al. 2007) and restricted geographic distributions (Krabbe & the rediscovery of two more (Toro & Flórez 2001; Schulenberg 2003). Owing to habitat destruction Krabbe et al. 2005). Five species of birds are and to their small geographic ranges, several species endemic to this mountain range: Gorgeted Puffleg of antpittas are threatened with extinction (Renjifo (Eriocnemis isabellae), Colorful Puffleg (E. et al. 2002), although part of their apparent rarity mirabilis), Dusky Starfrontlet (Coeligena orina), might actually reflect insufficient information Munchique Wood-Wren (Henicorhina negreti), and regarding their distribution and ecology (Kattan & Chestnut-bellied Flowerpiercer (Diglossa Beltrán 1997; Krabbe & Coopmans 2000). With gloriossisima). All occur above 2200 m, exhibit increasing knowledge of the vocalizations of highly localized distributions, and are considered Neotropical birds, in combination with expeditions threatened with extinction (Salaman et al. 2002; to several previously unexplored sites over the past Toro 2002; Salaman et al. 2003; Krabbe et al. 2005; decades, a significant number of species of antpittas Cortés-Diago et al. 2007). have been recently described, especially in the genus Grallaria (Lowery & O'Neill 1969; A recent survey by an Evaluation of Biodiversity of Schulenberg & Williams 1982; Graves 1987; Stiles the Andes Expedition (EBA) team to the Páramo de 1992; Krabbe et al. 1999). In this paper, we Frontino (also known as Páramo del Sol or Páramo document the existence of yet another previously de Urrao) in Dept. Antioquia (Flórez et al. 2004) led unknown species in this genus from the Cordillera to the rediscovery of the Dusky Starfrontlet Occidental of the Colombian Andes. (Coeligena orina) and revealed the existence of populations of other rare and threatened bird species The Western Andes are, on average, the lowest of in this part of the northern Western Andes (Krabbe the three ranges of the Colombian Andes et al. 2005, 2006). Thus, with the goal of protecting (Hernández-Camacho 1992). Only seven peaks habitat for threatened species in the area, Fundación along the ca. 1200 km length of this range reach ProAves promoted the establishment of the Reserva sufficient elevations to support paramo habitats; Natural Colibrí del Sol in the municipality of Urrao, because the cordillera is much lower in many areas, Antioquia (Fundación ProAves 2009). these high-elevation habitats are highly isolated (Krabbe et al. 2006). The most extensive areas During regular monitoring activities conducted on covered by paramo vegetation occur in the northern 27 September 2007 at 2780 m elevation in a forest sector, in the departments of Chocó and Antioquia. near Páramo de Frontino, DCA captured an unsual These areas have received relatively little attention antpitta in the genus Grallaria that was examined, from ornithologists. In fact, most of the earlier measured, and released. This individual could not be expeditions to montane areas of the department of photographed, but it clearly did not match any of the Antioquia focused on the Central Andes (around species of antpitta known to occur in the area. A the city of Medellín), whereas studies in the second individual was captured, measured, exam- Western Andes concentrated on its southern sector ined, photographed, and released on 5 February (reviewed by Cuervo et al. 2003, 2008). Although 2008 within the same forest, some 400 m from the recent studies have increased our understanding of site of the first capture. On 20 February 2008, DCA 58 New species of Grallaria from Colombia Carantón-Ayala & Certuche-Cubillos set mist nets in the same forest in order to capture Diagnosis.- A medium-sized antpitta (ca. 57 g), the then mysterious Grallaria, but owing to heavy assigned to the genus Grallaria based on its typical rains was unable to operate them. However, when shape and proportions, strong bill markedly curved opening the nets on the morning of 21 February, a from the base, conspicuous rictal bristles, short and dead bird was found hanging from one of them; rounded wings, long tarsi, short tail, 2-notched apparently one of its feet got entangled after it sternum, distinctive tarsal scutellation, and perched on the closed net. Serendipitously, this terrestrial habits. It can be distinguished from other individual turned out to be an antpitta matching the species in the genus by its combination of two main ones observed and captured earlier at the site. DCA colors, brown-olive above and gray below. The new and KCC prepared the specimen and compared it species is similar to G. milleri, probably its closest with those of other species in the genus deposited in relative, but can be diagnosed based on the the ornithological collections of the Instituto de combination of (1) plumage characters: the new Investigación de Recursos Biológicos Alexander species has a more olivaceous dorsum, a brownish- von Humboldt (IAvH), Instituto de Ciencias olive throat (whitish in G. milleri), and lacks a Naturales at Universidad Nacional de Colombia brown pectoral band and contrasting whitish (ICN-MHN), and Universidad
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